Yeah, Obama or Lincoln actually being a king is hyperbole, although not completely invalid criticism. Both have tried to act like kings. Lincoln was much more effective at it, while Obama is kind of a "Poor man's despot".
I think calling Lincoln king is reasonable, although again, hyperbole. When you start locking people up outside of the legal system, I think that that's acting kind of like a king.
I don't know how Obama managed to do that free-speech zone thing. At least people aren't being locked up for criticism (As far as we know) today.